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What is the most important information I should know about metolazone?

You should not use metolazone if you are unable to urinate, or if you have severe liver disease.

What is metolazone?

Metolazone is a thiazide diuretic (water pill) that helps prevent your body from absorbing too much salt, which can cause fluid retention.

Metolazone is used to treat fluid retention (edema) in people with congestive heart failure, or a kidney disorder such as nephrotic syndrome. Metolazone is also used to treat high blood pressure (hypertension).

Metolazone may also be used for purposes not listed in this medication guide.

What should I discuss with my doctor before taking metolazone?

You should not use metolazone if you are allergic to it, or if you have:

severe liver disease; or

if you are unable to urinate.

To make sure metolazone is safe for you, tell your doctor if you have:

an electrolyte imbalance (such as low levels of potassium or magnesium in your blood);

a heart rhythm disorder;

an allergy to sulfa drugs;

liver disease;

kidney disease;

diabetes;

gout; or

systemic lupus erythematosus.

Using metolazone during pregnancy could cause side effects in the newborn baby, such as blood cell problems, or jaundice (yellowing of the skin or eyes). Tell your doctor if you are pregnant or if you become pregnant while using this medicine.

Metolazone can pass into breast milk and may harm a nursing baby. You should not breast-feed while using this medicine.

Metolazone is not approved for use by anyone younger than 18 years old.

How should I take metolazone?

Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.

Metolazone is usually taken only once per day.

You may need to limit salt in your diet while taking this medicine. Follow your doctor's instructions carefully.

While using metolazone, you may need frequent blood tests. Your blood and urine may both be tested if you have been vomiting or are dehydrated.

Metolazone can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using metolazone.

If you need surgery, tell the surgeon ahead of time that you are using metolazone. You may need to stop using the medicine for a short time.

If you are being treated for high blood pressure, keep using this medicine even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medicine for the rest of your life.

Store the tablets at room temperature away from heat, light, and moisture.

What happens if I miss a dose?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking metolazone?

Drinking alcohol with this medicine can cause side effects.

Avoid becoming overheated or dehydrated during exercise, in hot weather, or by not drinking enough fluids. Follow your doctor's instructions about the type and amount of liquids you should drink. In some cases, drinking too much liquid can be as unsafe as not drinking enough.

What are the possible side effects of metolazone?

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

other signs of an electrolyte imbalance --dry mouth, nausea, vomiting, weakness, drowsiness, lack of energy, muscle pain, little or no urination, or feeling restless; or

severe skin reaction --fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.

Common side effects may include:

dizziness, spinning sensation;

drowsiness, tiredness;

depressed mood;

muscle or joint pain;

numbness or tingly feeling;

nausea, stomach pain, loss of appetite; or

diarrhea, constipation.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect metolazone?

Taking this medicine with other drugs that make you make you light-headed can worsen this effect. Ask your doctor before taking metolazone with a narcotic pain medicine, muscle relaxer, or medicine for anxiety or seizures.

Tell your doctor about all your current medicines and any you start or stop using, especially:

This list is not complete. Other drugs may interact with metolazone, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.

Where can I get more information?

Your pharmacist can provide more information about metolazone.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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